docs: def main():
      """
      1. Parse CLI arguments.
      2. Patch the environment with Python and libraries paths. This relaunches Python!
      3. Launch IPython if requested
      4. Load Chimera. IPython can import it now!
      5. Run any additional CLI arguments (-m, -c, -f), if needed
      """
      patch_sys_version()
      args, more_args = parse_cli_options()
      if args.path:
          print(guess_chimera_path()[0])
          return
      patch_environ(nogui=args.nogui)
      if not args.nogui:
          sys.argv.remove('--gui')
      if args.command != 'notebook':
          enable_chimera(verbose=args.verbose, nogui=args.nogui)
      if args.nogui:
          run_cli_options(args)